Journey inside the bowels of this sperm whale sculpture.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This pre-Hispanic apartment complex also includes ancestral paintings that point to its military past.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

This lavish estate recalls the opulent history of Calcutta.

This huge clock made of flowers and simple machinery was once used a political weapon.

An enormous goose sits atop this nest-shaped home.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

The only surviving fragment of the lost Narragansett Pier Casino.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Drink wine handed out through a window as part of an age-old tradition.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.