Largest Roman Catholic church in North America.

The site of the climactic scene from the classic horror film is now a historic landmark.

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A semi-scholarly approach to sex.

Visit the monolithic tomb of America's most famous general.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.