The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

An urban laboratory.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A wonderful and easily overlooked museum tucked in Ohio's Burke Lakefront Airport.

It would take 35 firetrucks to fill this enormous glacial pothole.

The world's smallest drawbridge.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

Once America's longest-manned military fort, now an abandoned hulk.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

Mysterious rocks that ring musically when struck.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A historic Montreal market that was the city's agricultural hub for over century.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A crumbling hospital from the 1850s on Roosevelt Island.

What began as an art installation is now the private drinkhaüs for a brewery's employees.

This museum chronicles the history of a leprosy quarantine hospital that then became a refuge.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

One of only two remaining Victorian-era greenhouses in New York.

A hidden architectural treasure in New York's Brooklyn.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A mysterious air force base built to resemble a Long Island fishing village.