Bratislava Castle.

The building includes “four towers (one on each corner) and a courtyard with an 80 m (260 ft) deep water well. The largest and tallest tower is the Crown Tower on the southwest corner. The 47 m (154 ft) tower dates from the 13th century and for approximately 200 years beginning in the mid-1500s housed the crown jewels of Hungary. The exterior walls and inside corridors contain fragments of old Gothic and Renaissance construction elements. The walled-up entrance gate from the 16th century is still visible to the east of the main hall/entrance”.