Ruins of an old sugar mill sitting quietly next to a park in rural Florida.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

This ancient Egyptian obelisk still bears the wounds of World War I.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

A lightship turned museum, outfitted with artifacts from the vessel's past as part of the U.S. Lighthouse Service.

A piece of the Ludendorff Bridge, also known as Remagan Bridge, calls this military base home.

One of the Treasury Building's original columns now sits as a garden monument in the middle of a busy military base.

This environmental engineering marvel keeps salt water from the Elizabeth River.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

Train fans from all over flock to this railroad viewing park where three lines converge.

Just outside the Ohio Supreme Court sits a testament to justice.

A school used as a model for public education across the country.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

This parking garage was the site of what was - at the time - the largest cash robbery in history.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

Narrowest house in Boston.

This landmark cemetery in Boston was created more than 300 years ago.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.