Supposed Massachusetts Grave of a pre-Columbus Knight Templar.

An enormous, inside-out glass globe built in 1935.

Prank calls to this place, originally the "Tube Bar," inspired the creation of a Simpsons character.

Originally built in 1869, this castle is currently part of Felician University's campus.

These mystical miniature houses bring a touch of magic to the New Jersey woods.

Thomas Edison's home and final resting place also boasts an impressive garage, where some of the earliest electric cars are on display.

Though tiki culture has gone in and out of fashion, the Tonga Hut has always been flying the flag in Los Angeles.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

The smallest covered bridge in Maryland.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An abandoned stretch of highway, deteriorating next to the operational one.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

A local prank turned town icon.