This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

An Aztec snake god has taken the material form of an apartment complex.

A monument to the art of slicing people open.

Dr Barnes' $25 billion private collection of art and arboretum.

World's first "penitentiary," meant to be humane, drove men insane.

The crumbling remains of a 19th century fortess.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

This historic New Orleans cemetery is the final resting place of members of the Independent Order of Odd Fellows.

Despite the ever pressing encroachment of urban sprawl this grand New Orleans manse still stands.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

A starship has landed in Texas, a welcome break for weary travelers from a drab stretch of I-35.

See the sky in a new way through this art installation.

It specializes in outsider art and artifacts of secret societies.

A modernist landscape of water and sci-fi concrete.

Circus cemetery for all the “showmen under God’s big top.”

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

The final resting place and once home of the Bandit Queen of the West.

Where hills of dirt conceal the burial ground of one of the most powerful ancient Native American societies.

A peaceful place in the woods where everything is a work in progress.

Curious rock formations in a tiny Kansas state park.

Self-built house and sculpture park where the creator can still be seen in a glass coffin.