This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

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

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Fortified medieval tower house with lovely roof garden.

Beautiful views and Roman-style statues on the Italian coast.

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

Water and windows define this defensive Italian well.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

A 16th-century horror show built in a lovely Italian garden.

A refurbished locomotive from a bygone era in the middle of the Jordanian desert.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Slum Settlement Filled With Mountains of Garbage.