Macbeth's infamous "Great Birnam Wood."

Enter the world under the hill at this ancient UK burial chamber.

A fernery hidden by neglect is uncovered, and an ancient specimen along with it.

Hidden in a Scotland museum is a copse of extinct tree stumps.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

The heads of two giant mythological water horses honor Scotland's horselord past.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This ordinary-looking mailbox has a rather explosive history.

The colorful stairs are made with marble from the world's major quarries.

Every birth, death, and marriage is recorded in these color-coded leather-bound books.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A 18th century graveyard and its astonishing cortege of macabre iconography.

A two-way chairlift system between Zugliget and the highest point in the city.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A 19th-century artistocrat's mansion, turned into a library, hidden in a modern library.

Remains of the old fortification along the Western border of the USSR, now an elaborate defense museum.

The old fire station features a mural that has more to it than first meets the eye.

Nearly three decades since the fall of the Soviet Union, the hero of the USSR still stands over Belarus.

Remnants of the city's Soviet history hover over this modern fast-food outlet.

Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

A statue honors the children who fought Nazis in Poland.