Art in the form of a winding, man made crack in stone.

A hidden subterranean installation offers a view of the sky.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

Life's work of sculptor Elisabet Ney remains preserved in her last studio.

A grove of colossal man-made flowers built to collect the sun's rays.

A former electrical substation is now home to an eccentric junk art masterpiece.

In France, a medieval-style home pays homage to an intrepid explorer who discovered Québec.

DIY collection of eclectic holdings.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

The "Seinfeld" diner.

A playground the size of a city block is a modernist monument to civic values and public housing.

After surviving abandonment, this powerful Latin American mural is alive again.

This 220-year-old house is a reminder of New York City's Dutch past.

The most confusing clock in New York.

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

A hidden architectural treasure in New York's Brooklyn.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

This 19th-century church is now a popular roller rink.