The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

Dive for drinks at Croatia's first and only underwater winery.

A replica of the first public theater built in California.

Bridges, terraces, and replicas of historic structures all built of rock and petrified wood by one man.

The longest continuous lava tube in Oregon.

Lemon Grove, California is known for its giant lemon...and mummified bodies.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A monument celebrating the idea of reaching inaccessible places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

FDR's Art Deco hospital tower was hopelessly inefficient.

Three hundred years of preserved Spanish colonial history in San Antonio.

An old whaling station now serves to give the public a look at the commercial whaling industry, no longer a part of Monterey's economy.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

This 19th century train workshop is a treasure trove of railroad history.

A working miniature city designed to teach kids about safety and presumably city planning.

Sports history, made in the Arroyo Seco.