The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

The world's oldest rose is so tough it survived being bombed in World War II.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

Possibly the oldest living thing in Europe, more likely a pagan survivor.

The world's oldest individual clonal tree looks like a wimp despite standing tall for 9,550 years.

A perilous medieval road leading right into the sea.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

Trace the history of writing at this unusual North Carolina destination.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

A beautiful maze marks where three countries meet.

This 600-year-old home seems to defy physics.

The world's longest and deepest train tunnel.

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

The Icelandic Sea Monster Museum explores the area's history of aquatic cryptid sightings.

This cuddly rodent has a place of honor at a Russian institute for genetic research.

There are two dozen tanks just sitting in an open field in Lower Saxony.