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Rock-cut cave complex filled with ancient Buddhist artwork.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The fifth-longest natural arch in the world, and the longest outside China.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

When ecosystems collide in the arid Southwest.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A European-style bath house in Chicago.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

This titanic Catholic church in Chicago is also a refuge of the fictional cult-favorite wizard detective Harry Dresden.

Along this stretch of beach in Denmark resides several massive bastions of energy.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

This sublime architectural marvel is a rare example of an expressionist church.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Everything from miniature biblical scenes to life-sized statues are almond-based at this sweet and nutty gallery.

"Medieval" castle built in the mid-20th century by one family.

An entire city block built completely out of petrified wood.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.