This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

What remains of the summer palace of King Kamehameha III.

Football field-sized microalgae production tanks on the Hawaiian coast create a stunning view from space.

The famous aviator's final resting place is a study in natural beauty.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A tunnel of hardened lava along Maui’s famous Road to Hana.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

Easter in Westminster may be the only time and place to behold Edgar Allen Poe made entirely of Marshmallow Peeps.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A priceless collection of the Nation's cryptologic history.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

Bizarre Cavern.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

An astounding collection of medical specimens, including bits of President Lincoln.

This free, take-a-book shop seems like a trick but isn't.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A unique sculpture park that specializes in the huge and bizarre.

An enormous overgrown greenhouse teeming with graffiti and wildlife.