One of the best places to see feral Colonial Spanish Mustangs in the United States.

The resting place of a Civil War celebrity's amputated limb.

This woodland architectural installation acts as a camera obscura for the heavens.

Where America's first doomsday cult awaited the end of the world.

Iconic rock formations that allow for exploration during high or low tide.

This Quebec estate is home to the elaborate gardens of a self-taught horticulturist.

Artistic cabins actually grow deep in the Canadian wilderness.

A lake formed in the basin of a massive impact crater takes the shape of an unbroken ring when viewed from above.

These quaint French houses dangle precariously over a precipice.

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

An entire city block built completely out of petrified wood.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

The largest self-built castle in the U.S., six decades in the making.

Robots, lasers, and whoopee cushions, oh my!

This striking art museum holds an amazing series of curiosity cabinets.

Complex aquaponics systems allow fish and plants to grow in harmony.

A bedazzled house and crown "jewel" of outsider artist Loy Allen Bowlin.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

An enormous cat made of recycled wood scraps.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

An abandoned 19th century quarry in the middle of the woods, remade by unnamed wanderers into a massive series of rock thrones.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

One man's swirling six-acre monument of stone.