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

A little-known hot spring haven right below the highway.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

This ancient Hawaiian henge may have been an early star chart.

Race through the maze, get your name on the sign.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

The grand marquee of this abandoned Hawaiian theater remembers the building's elegant past.

What remains of the summer palace of King Kamehameha III.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

Four hundred granite steps were built into this massive rock by the National Park Service.

A computer bug so primitive it was an actual insect.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The most decorated dog of World War I is preserved in the Smithsonian.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Perhaps the most scandalous statue of America's first president.

The site where hundreds of Greeks were tortured by the Nazi secret police is now a cosmetics store.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.