Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

The span is crooked and made from two older recycled bridges.

The whole world in one water tank.

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

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

This abandoned Victorian-style house was built in 1884.

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

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

A decaying garage hidden amid the dense forest is all that remains of a once-prosperous dairy farm.

These unusual rooms on wheels are holdovers from the 1960s.

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

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.