A toxic ghost town sitting atop a massive coal fire.

A park full of outsider art, created by college students studying outsider art.

One of the only memorials dedicated to journalists who died in combat.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

This pun was simply waiting to come to life, and one defense contractor made it so.

This might just be the TARDIS of bookstores.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

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

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

A nostalgic bibliographic gem.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

Remnants of a storybook amusement park hidden behind a strip mall.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

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

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

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

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