A sculpture for the sun and stars, created by Nancy Holt.

These curious caverns have been home to mushrooms, gangsters, and disco.

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

The world's only known button museum.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

This turn of the century masterpiece has a mysterious goaty interloper.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

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

Scattered around Atlanta are little doors with big charm.

A former utopian healing center created by a huckster and built by derelicts.

Home to drunken tower-climbing goats... seriously.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Abandoned silver mine strewn with wrecked and twisted structures.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

Commonly referred to as the most photographed Victorian home in the United States.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.