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

Eighteen miniature death-scene dioramas.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A remote horde of architectural treasures fit for Indiana Jones.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

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

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

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

The whole world in one water tank.

The nearly 120-year-old piece of pork wears a brass collar and was once a man's "pet ham."

This museum offers an actual time machine back through Colorado's past.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A downtown park built on top of unclaimed graves.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

A giant Troll lurks under one of Seattle's oldest bridges.