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

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

Two dozen pinball games hidden away inside a most unlikely location.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

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

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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

Giftshop catering to cryptozoologists and anyone with a sense of humor.

An Industrial Revolution-era public work that purified water using nothing but sand.

A derelict bit of transportation infrastructure hidden in the woods.

This grand gothic brewery has been pumping out suds for over a hundred years.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

The national park was once a plantation estate.

Home to items never before seen by the public.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A historic neighborhood church is reborn as a psychedelic arts collective.