A downtown park built on top of unclaimed graves.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

Once America's tallest structure, now a Baltimore landmark.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

Ship skeletons haunt Baltimore's waterways.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The trials and tribulations of marking Poe's grave.

The United States Capitol's former columns still stand.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

Submerged lava formations create incredible waterworks.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

This former luxury resort in Kaua'i is now an abandoned relic.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

A rare opportunity to drive across the ocean floor.

Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

The Atlantis of Cape Cod reemerges during the lowest of tides.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.