Built by prisoners of war, the largest small-scale model ever built includes eight miles of tiny streams that now sit abandoned.

Stockholm's tiniest statue is of a small boy looking at the Moon.

The largest permanent Monopoly board makes one of the longest games even bigger.

This museum is dedicated solely to this millennia-old handheld cooling device.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

Regency-era excess on the English Coast.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

Every May, townspeople welcome summer with a bizarre pagan parade led by a man wrapped in garlands.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

This medieval church is the only one in the world that features all Marc Chagall stained-glass windows.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

Large Hadron Collider and the Birthplace of World Wide Web.

Art in the form of a winding, man made crack in stone.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

The original place where water met land in the City by the Bay is outlined in brass.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.