This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Before Nixon, "watergate" meant canals.

Decades before the scandal, this staircase on the river was a literal "water gate."

A portal into the bricked up canal that runs through the heart of Washington D.C.

A historic ruin just 20 feet away from a busy highway onramp.

The most accurate timepiece in the world.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.