This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Hundreds of trees made from glass bottles make up this forest on Route 66.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A fitting attraction for the corn capital of the world.

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

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A complimentary beverage is offered to the bodega's resident rodents every day.

The world's most elegant power lines.

The defensive tower was built centuries ago to warn locals of Berber pirate attacks.

Single runway interrupted by a busy road that cuts across its middle.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

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

Dead weights honor the dead of Portugal's fishing industry.

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

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

A public urinal so pretty, it was declared a national monument.

The first declared National Monument in the United States.

The many—66 to be exact—faces of the German forest.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.