Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

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

Ruins from the Parthenon and petrified wood line the interior of one of the world's most famous monuments.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Situated in a bustling intersection, this "mobile" monument that honors local veterans from five different wars has moved several times but appears to have found its final resting place.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

The national park was once a plantation estate.

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This Las Vegas casino boasts one of only three spiral escalators in the United States—an engineering wonder.