America's post-nuclear-attack chambers of Congress.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

After miraculously surviving a giant flood, the 19th-century nut tree and its offspring are protected with their own tiny park.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

A hamlet full of permanent Christmas spirit holds one of the earliest theme parks in the United States.

Dozens of houses in the Adirondack Mountains are reminders of a literal "cottage industry" to cure people of a deadly disease.

More than 12,000 years ago, this park was a playground for mastodons.

An exhibition devoted to the life (and posthumous taxidermy form) of the last known representative of the Pinta Island Tortoises.

Since the 1700s, this old barrel has acted as a post box that relies on the kindness of travelers.

This museum sits on the site of a decommissioned military communications base.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This four-story steel sphere in Maryland was used to test biological weapons.

The final resting place of a prominent Black American farming family sits in the shadows of an IKEA store.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The oldest continuously operating fish market in the United States.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

This historic hotel invented the chocolate brownie.

A kitschy, creepy St. Louis mainstay.

This massive statue is the personification of Bavaria and the first colossal statue of the modern period composed of bronze.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.