The Basilica of St. Peter and St. Paul is a neo-Gothic church in Vyšehrad fortress in Prague, Czech Republic.
Founded in 1070–1080 by the Czech King Vratislav II, the Romanesque basilica suffered a fire in the year 1249 and has been rebuilt in Gothic and later in neo-Gothic style. The basilica features an impressive stone mosaic above its entry, and its twin 58 m towers can be seen atop a hill to the south from along the Vltava River in central Prague.
The Basilica and Royal Collegiate Church of St. Peter and St. Paul
Basilica Cistern, Istanbul, Turkey built in the year 532 during the reign of Justinian I. It supplied the city with water and is approx. 9800 m² of surface. It is capable of holding between 80,000 and 100,000 m³ of water.
Basilica di San Clemente al Laterano in Rome, Italy
Under the basilica that stems from the 12th century, there are two more layers that you are able to visit: a basilica from the 4th century and a mithraeum from the 2th century.
In my opinion the most interesting church Rome has to offer.