This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

Native Americans built this circle of stones, which was used to predict astronomical events.

Ancient human, animal, and geometric figures drawn in the earth.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

This overlooked gem outside Niagara Falls preserves and celebrates Iroquois culture.

When an ancient supervolcano erupted, some of Nebraska's prehistoric animals were forever preserved in ash.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

A historic house devoted to the teachings of a 1700's prophetess and her mysterious box of revelations.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

The house where John Wilkes Booth conspired with his co-conspirators.

Home to items never before seen by the public.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

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

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

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

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

People escaping slavery passed through the oldest house in Lombard, Illinois on their northbound journey to freedom.

The famous author's birthplace is preserved in a town that he once described as narrow-minded.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

This small museum is kept in a house that was integral to the genesis of Uncle Tom's Cabin.

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.