A celebrity from the late Cretaceous period.

A priceless collection of the Nation's cryptologic history.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

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

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

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

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

This recreation of a 19th-century dime museum is full of oddities.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

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

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 U.S. government built the million-pound stack of steel during the Space Race.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.