This whimsical stacked cabin looks like something out of a children's book.

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

A hidden three-foot-wide house separates these two regal churches.

This Michelin-starred restaurant sheds light on a rare period of cultural and culinary tolerance in Cordoba’s past.

This medieval "painted village" is famous for its geometric facades.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

The world-record holder for the longest bridge stretching continuously over water.

A tunnel with windows, so you don't miss out on the impressive views.

Denmark’s never-ending bridge.

Sweden's southernmost point is located in this charming fishing village.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

This whimsical fountain pays tribute to Toronto's four-legged friends.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

A disconnected rotary phone for "calling" lost loved ones offered a unique way of dealing with grief in disaster-stricken Japan.

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

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This hulking behemoth is actually five interconnected towers built in the 1960s.

A flight of this "ghost staircase" has 40 steps on the way up, but only 39 steps on the way down.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A uniquely lettered street sign marks the corner where the iconic word game was invented.