While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

Largest man-made excavation on earth!

Largest collection of mounted dinosaur specimens in the world.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Bizarre Cavern.

The trials and tribulations of marking Poe's grave.

These unusual rooms on wheels are holdovers from the 1960s.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Extraordinary objects lurk in this quintessential regional museum.

This pun was simply waiting to come to life, and one defense contractor made it so.

America's first public mental health facility.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Outsider art meets paleontology at this roadside reptile repository.