An emporium for the weird, creepy, rare, and just plain gross.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

The oldest county library in the United States.

What was once a communal kitchen now serves heaping portions of hearty German fare.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

The legacy of a wealthy executive and his wife, this little-known art museum features works by Picasso, Monet, Renoir, Cezanne, and more.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The seamy, underground secrets of Portland's criminal past.

Explore a real 19th-century lead and zinc mine at this immersive series of exhibits.

This museum was once the home of industry titan Matilda Dodge Wilson.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

This luxury hotel suite is located deep in the bowels of an old mine.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

An oddity shop filled with taxidermy, funerary memorabilia, and more.

Spend the night in this formerly abandoned traditional Scottish village.

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

Mile-long cave system near Great Smoky Mountains.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.