Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

The only free-standing, vertical sundial in the US was keeping standard time before it was even invented.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

A lonely beacon, precariously perched atop a remote sliver of rock.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

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.

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

A Spanish-style estate that has traded black ties for rock concerts.

Ancient church constructed with a special wood that preserves prints from the past.

An eclectic treasure trove of maritime marvels.