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

Time travel with sweets across history at this research-based candy store.

Endless rows of boxes of paper records line the hallways of the archaic federal facility where guns are traced.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

A remote horde of architectural treasures fit for Indiana Jones.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A Civil War Museum with some notable medical antiques.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

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

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

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

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

Bizarre Cavern.

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

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.