The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

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

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The national park was once a plantation estate.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

There aren't too many operational funiculars around, but Pittsburgh has two!

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

The Laureates here get something even more coveted than a Nobel Prize: free parking for life.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

A 90-acre park on former landfill that hosts an annual kite festival.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

Frank Lloyd Wright died a year before construction on his largest public project even began.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

A crumbling hospital from the 1850s on Roosevelt Island.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.