This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This colorful gate stands as an entrance to the walled city of Old San Juan.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

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

It wouldn't be long after purchasing this farm, Brown would lead his siege on Harper's Ferry.

The private island of Yale's elite Skull & Bones society is kind of a dump.

This tiny little island has, as the name says, just enough room for its single house.

A castle built for love, and abandoned due to heartbreak.

This observation tower is a longstanding, 1960s landmark in the Thousand Islands region of Canada.

Every summer, the Mendenhall River greenbelt comes alive with an explosion of magenta flowers.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

A giant roll of mints marks the birthplace of one of America's most famous candy brands.

An out-of-the-way wildlife haven with a rich and storied past of harboring thousands of fugitive slaves, or "Maroons" during the mid 1800s.

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.

The North Carolina grounds are leased in perpetuity to the British Commonwealth for as long as the WWII sailors are buried there.

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

This historic sunny-yellow building has an unfortunate connection to the sinking of the Titanic.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

So many migrating birds roost on the bridge, it has a special summer speed limit.

The lesser-known lost colony of Roanoke was a safe haven for formerly enslaved people during the Civil War.