The mummified relic of St. Antoninus.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

Art and armour fill every inch of this rich kid's Italian villa.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The first declared National Monument in the United States.

America's largest man-made forest was planted in an effort to bring back the past.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

Fantastic collection celebrating the final send-off.

Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.

The summer home of the largest colony of bats in the world.

Established in 1925, Kiddie Park claims to be the oldest amusement park in the U.S. - a cozy little time warp nestled in a shady corner of the modern world.

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

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

The 40-foot-tall votive candle is the largest of its kind.

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

The only museum with its curator—and her pets—buried inside.