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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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

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

Home to items never before seen by the public.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

An old train trestle re-imagined as an Egyptian obelisk.

An abandoned town is hidden in Great Smoky Mountains National Park.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

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

A technicolor place of worship for Elevationists.

Hidden amid a collection of trails is the site of a tragic crash.

This vast kitty-themed collection illustrates the history of human-cat interaction.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

An institution that preserves the history of institutionalization.

This offbeat trailer park is home to vintage peddlers, local artists, indie makers, and more.

Seattle's super-sized cowboy apparel once belonged to a themed gas station that wrangled in herds of tourists.

The world's largest egg has been cracked a number of times over the years but has been repeatedly replaced.

A walk through the historic city center, under the streets of Seattle.

The short-lived railroad town in central Oregon has been abandoned since the 1930s.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.