A painfully obvious spy house sits right across the street from the Russian Embassy.

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

An astounding collection of medical specimens, including bits of President Lincoln.

Brain collection and database that narrows the gap between man and animal.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

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

The ruins of this long-abandoned unsuccessful gold mine can still be found.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

This abandoned Victorian-style house was built in 1884.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

The whole world in one water tank.

Tiny observatory made big contributions to the study of the Earth's motion.