One of the magnificent ancient buildings of İstanbul is the Basilica Cistern located in the southwest of Hagia Sofia. Constructed for Justinianus I, the Byzantium Emperor (527-565), this big underground water reservoir is called as “Yerebatan Cistern” among the public because of the underground marble columns. As there used to be a basilica in the place of the cistern, it is also called Basilica Cistern.
The cistern is a giant structure covering a rectangular area of 140 meters in length and 70 meters in width. Covering a total area of 9,800 m2, this cistern has a storage capacity of approximately 100,000 tons of water. There are 336 columns, each 9 meters high, inside this cistern, which is descended by a 52-step stone staircase. These columns, erected at intervals of 4.80 meters, form 12 rows of 28 columns each. Most of the columns, which are understood to have been collected from older structures, were carved from various types of marble and consisted of one piece and two pieces. The walls of the cistern, 4.80 meters thick, made of bricks and the brick-paved floor, were plastered with a thick layer of Horasan mortar and made water impermeable. http://yerebatan.com/
Aqua Vega Aquarium is one of Turkey's and Europe's largest tunnel aquariums, with a total capacity of 4.5 million litres of waters and 98 meters in length.
Aqua Vega Aquarium has large and small, consisting of salt and freshwater aquariums with different characteristics. In this atmosphere, you can be guest into the world of fascinating sea creatures from the oceans and rivers of the world.
The world's seas and oceans are still a huge universe waiting to be discovered. You have the opportunity to discover this colourful and peaceful world of the sea creatures with Aqua Vega Aquarium in the center of Ankara. https://www.goturkeytourism.com/things-to-do/aqua-vega-aquarium-ankara.html
With its 66 streets and over 4000 shops, the Grand Bazaar is the biggest covered bazaar in the world. The Grand Bazaar (Kapalı Çarşı in Turkish) is an overwhelming experience for many. Sellers hawk their wares at the top of the voice, everyone has their own technique to entice you in, the colors, lights and sounds create an exotic and unique atmosphere. http://kapalicarsi.com.tr/tr/
The area is between Yesilhisar and Yahyali in the province of Kayseri, and consists of four different locations: Yay Lake (3650 hectares), Kebir Sazligi (1900 hectares), (Sultansazligi (3300 hectares) and Otluk Alan (8350 hectares). http://www.kultur.gov.tr/EN,99906/kayseri---sultansazligi-nature-reserve.html
The Blue Mosque (Called Sultanahmet Camii in Turkish) is an historical mosque in Istanbul. The mosque is known as the Blue Mosque because of blue tiles surrounding the walls of interior design.Mosque was built between 1609 and 1616 years, during the rule of Ahmed I. just like many other mosques, it also comprises a tomb of the founder, a madrasa and a hospice.Besides still used as a mosque, the Sultan Ahmed Mosque has also become a popular tourist attraction in Istanbul.
Besides being tourist attraction, it's also a active mosque, so it's closed to non worshippers for a half hour or so during the five daily prayers.
Best way to see great architecture of the Blue Mosque is to approach it from the Hippodrome. (West side of the mosque) As if you are non-Muslim visitor, you also have to use same direction to enter the Mosque. http://www.bluemosque.co/
Aktur Park is a funfair in the heart of the city and has a range of rides and attractions on a medium sized location, plenty to keep the kids (and young at heart) entertained for a few hours.
With all the traditional stalls, candy floss (cotton candy for our USA friends) and toffee apples etc, some sideshows in the style of "hit the target to win" and there are some well maintained large amusement rides including a small roller-coaster, pirate boats, go-karts and dodgem cars etc. a good mix of rides suitable for all ages.
Like most parks like this its most atmospheric in the evenings and night, not to mention it's probably too hot to visit in the daytime anyway. http://antalyacentral.com/attractions/aktur-park-funfair
No visit to Istanbul is complete without stopping by the atmospheric Spice Bazaar. While the Grand Bazaar may be the largest and most famous of Istanbul's covered bazaars, this spice market wins the prize for being the most colorful, fragrant, and often the most fun – as visitors can taste the goods on offer. https://istanbultourstudio.com/things-to-do/spice-bazaar
The archaeological excavations carried out by Turkish Historical Society in 1941 showed that the first settlement on the hill goes back to 3000 BC, Early Bronze Age.  Later on, the hill had also been used as a settlement area during Phrygian, Hellenistic, Roman, Byzantine, Seljuk and Ottoman eras. http://konya.com.tr/en/portfolio-item/alaeddin-tepesi/
It is located on the promontory of the historical peninsula in İstanbul which overlooks both the Marmara Sea and the İstanbul strait. The walls enclosing the palace grounds, the main gate on the land side and the first buildings were constructed during the time of Fatih Sultan Mehmet (the Conqueror) (1451 - 81). The palace has taken its present layout with the addition of new structures in the later centuries. Topkapı Palace was the official residence of the Ottoman Sultans, starting with Fatih Sultan Mehmet until 1856, when Abdülmecid moved to the Dolmabahçe Palace, functioned as the administrative centre of the state. The Enderun section also gained importance as a school.
Topkapı Palace was converted to a museum in 1924. Parts of the Palace such as the Harem, Baghdad Pavilion, Revan Pavilion, Sofa Pavilion, and the Audience Chamber distinguish themselves with their architectural assets, while in other sections artefacts are displayed which reflect the palace life. The museum also has collections from various donations and a library. https://www.ktb.gov.tr/EN-113953/istanbul---topkapi-palace-museum.html
Erciyes, with an elevation of 3916 meters, is a volcanic mountain whose summit is always covered with snow and fog and has become synonymous with the city of Kayseri. This lava-spewing mountain, responsible for the 'fairy-chimney' rock formations in nearby Cappadocia, impressed the Meek people living at its base so much that their coins bear an impression of the mountain with lava boiling out of the top. The first person to successfully make the summit was W. J. Hamilton in 1837, and the first Turk was Miralay Cemil Cahit Bey in 1924.
Besides being a popular spot for mountain climbers, it is also one of Turkey's best winter-sport resorts. From the top of the mountain, if the weather is clear, there is a stunning view of an area stretching from Cappadocia to the Taurus Mountains. http://www.kultur.gov.tr/EN,99413/kayseri---mount-erciyes.html
It is estimated that the building, which was considered as the largest closed market after Istanbul in the Ottoman period, was built in the 15th century. The only inscription in the building, which contains many bazaars with different names, is located in the bazaar built by Hacı Efendi in 1844. The bazaar, almost all of which was burnt as a result of the fire in 1870, was rebuilt with stone materials with the efforts of Osman Pasha of Maraş. The building is referred to as the "magnificent masonry market" that covers more than two thousand shops and shops in the 1907 Ankara Yearbook.
The Grand Bazaar still houses shops where local food and handicrafts are sold. https://www.kayseri.bel.tr/kesfet-listeleme/kapali-carsi