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

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

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

These lush botanical gardens employ the most purrfect pest control force.

A hidden alley in urban Baltimore is a haven for graffiti artists.

An outlandish shoe shaped house built by an eccentric millionaire.

These abandoned waterworks are crumbling into the Potomac River.

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

This former Cold War missile control site played an important role in the creation of GPS.

A museum dedicated to exhibiting remarkable outsider art.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States