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

An abandoned castle owned and ignored by Masons carries a cursed history.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

One man's ambition created this psychedelic log home.

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

Naturally protected city carved from a rock face.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

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

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

A Saint Nicholas-themed ghost town in the Mojave desert.

An Italian hillside ghost town.

Yup, that's a 330-foot yacht passing over the highway.

An L.A. traffic island where the faces of locals have been carved into massive granite eggs.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Long tunnels run under the ancient chariot racing circuit to the tower.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

A historic cemetery doubles as a museum containing hundreds of unique tombs sculpted by a single artist.