Naturally formed rock city in Poland.

A wooden replica of France's famous tower.

Mysterious craters may have been home to an ancient cult.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Fortified medieval tower house with lovely roof garden.

The Uros people live on floating reed islands in lake Titicaca.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Giant pagoda houses the car that drove Thích Quảng Đức to his death by self-immolation.

Guatemalan womanizer, venerated during Holy Week.

142 ceramic steps become a mosaic once a year.

These mammoth-yet-narrow crevasses in the Earth are perfect for taking an otherworldly swim.

Frida Kahlo's childhood home, now a museum of her life and works.

Where cemeteries are carved into the side of cliffs and infants are buried in the hollows of trees.

In Egypt's expanding metro area, many of the neighbors are dead.

Myanmar's Mount Olympus atop a 2,500-foot volcanic plug.

The lavish temple of the Cao Dai religion that includes Buddha, Mohammed, Joan of Arc, and Victor Hugo.

Rock carving created 1,300 years ago 75 feet off the ground.

This medieval fortification has weathered the centuries better than any other structure from its era.

A blooming house of worship for the masses.

Rock-cut cave complex filled with ancient Buddhist artwork.

Explore this massive series of 45 caves and over 51,000 sculptures carved from cliffsides in China.

A fifth-century temple improbably built into the side of a cliff.

A mythically themed self-built sculpture park.

Bizarrely-painted church designed by a controversial artist.