Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

Venice's "Island of the Mad."

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

This is the oldest Roman-made bridge in the city still existing in its original state.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Secret refuge and museum of the Duke of Florence.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

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

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

This castle was once considered as an option for the Royal Family's alternate residence, but you may know it better from the 'X-Men' movie.

A famous hotel houses an impression collection of mini dioramas and giant doll houses.

This historic Victorian hotel has a scandalous history of affairs and murder.

This seaside production studio was built to film 'Titanic' and has been the wet set of choice for other Hollywood productions since.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.