This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

This single room has survived the centuries with almost no deterioration.

A hugely vast Irish landscape of barren rock that stretches for miles.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

Remnants of a storybook amusement park hidden behind a strip mall.

Ship skeletons haunt Baltimore's waterways.

This former asylum for Black Americans is haunted by its history of violence and racism.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

At 207 feet, one of the world's longest continuous escalators.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

A six-foot pair of socks hangs from a drawer of the world's largest bureau.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.