Cars mysteriously roll uphill on this street.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A lake in the middle of the tundra of Quebec is said to be the purest freshwater lake on Earth.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

New fungal and bacterial species call this deadly lake home.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The great Danube river starts here.

The United States Capitol's former columns still stand.

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

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

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.

A wondrous old library overlooking the nation's capital.

A derelict bit of transportation infrastructure hidden in the woods.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

A historic neighborhood church is reborn as a psychedelic arts collective.

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