Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

It houses the remains of a 17th-century version of the Titanic.

The world's largest model of our planetary system.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Macabre astrological automaton clock dating to the late 1400s.

The world's second-largest sundial, made entirely out of stone.