This large, circular tomb is the final resting place of the first emperor of Rome.

During World War II, blimps were a key part of the United States' defense against German U-boats—this building could house a dozen of the armed airships.

Believe it or not, this is the final resting place of the man who created the Odditorium.

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

This museum is dedicated to the workers that help keep the power on.

The granite monument is engraved with the image of the talking horse's head coming through a barn door.

The country music legend's grave is surrounded by Astroturf because fans kept plucking out the grass.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Conjoined twins Daisy and Violet Hilton were stars of the vaudeville circuit.

A water pumping station disguised as a residential home to assuage concerned neighbors now tricks most passersby.

This one-room cabin where the young colonel slept during the French and Indian War.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

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

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

A celebrity from the late Cretaceous period.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The time thousands of bags of chips washed ashore in the Outer Banks is memorialized in a local museum.

The show's fictional Korean medical camp was created in the Santa Monica hills.

A sweet tribute to Georgia's official state vegetable, which even has its own mascot: "Yumion."

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.