The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

An exquisite example of Uyghur Islamic architecture.

The world's largest natural arch was forgotten for over 50 years after its discovery.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

A small cemetery chapel designed by Frank Lloyd Wright and built in 1906.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

Where old school Polish Chicago and young hipster Chicago live side by side.

The 30,000-volume library is one of the world's most impressive poetry collections.

First planned industrial community in the United States.

Cemetery featuring rare glass-fronted columbarium.

The world's only known button museum.

The beloved home to all publications indie, erotic, and punky.

All of Chicago's wood-paved streets are long gone but two alleys remain.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

An enormous park-like oasis, full of famous Chicagoans' graves.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

A windswept necropolis carved into the rocks overlooks the "most Portuguese town in Portugal."

A cluster of granite granaries perched on stilts.