A cemetery and the town it served sinks beneath the sea during the volcanic birth of Mt. Vulcan.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

The world's brightest bioluminescent bay.

A local prank turned town icon.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

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

Exact replica of the ancient monument, but much, much lighter.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Home to items never before seen by the public.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The world's oldest soul food restaurant is also one of its best.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

The most accurate timepiece in the world.

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

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

An alternate history park where the Union Army loses the war... to dinosaurs.