Duluth mineral magnates built this charming art deco lodge to be their private clubhouse.

These abandoned grain silos and tunnels are an urban exploration dream.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

The walls of the iconic dome are hollow and have a secret stairway.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

An inconspicuous footbridge beloved by San Diego locals.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

An eclectic trailer park retreat in the middle of the California desert.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

Home to a vast and influential collection of Shakespeareana.

This lovely pocket park is one of the most under appreciated in D.C.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The United States Capitol's former columns still stand.

One man's eclectic collection of treasures found at sea.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Giant topiary dog once played a role in a terrorist bomb plot.

To honor his gardening wife, this yard artist turns bowling balls into playful, colorful sculptures.