This giant temperature attraction created some giant electric bills.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The ghost town that ended up on Ebay.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

This bare tree might not have leaves but it is constantly clothed in festive decorations left by mysterious local benefactors.

The only working large-scale tea plantation in the United States.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

A bronze of the man in all his sinewy glory celebrates his longtime connection to the Ohio city.

Bison, America's national mammal, are staging a slow comeback in Ohio's prairie parkland.

Ohio's 19th-century communist micro-society.

Look closely and you’ll notice that the color changes a third of the way up the tower.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

St. Augustine's record-setting narrow street was designed to protect against pirates.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

Low-frequency noise compared to an idling train can only be heard by some of this industrial town's residents.

The most accurate timepiece in the world.

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