Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

The statue honors an adventurous seafaring cat.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

This cheese shop also houses a museum devoted to Dutch dairy.

A boardwalk winds through this sliver of coastal nature hidden within Sydney.

This 18th-century former mosque held the first Hellenic Parliament.

Enormous sandstone towers loom within a Czech forest.

This experimental utopian "city of the future" in rural India may hold a dark secret.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

This 17th-century mausoleum is topped with an acoustic marvel.

The busy transport hub is home to the tallest airport slide in the world.

The location of this historic castle was inspired by a donkey.

Legend says this rock was once a chopping block for public executions.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

Wooden sleds have replaced donkeys to cart goods around this utterly charming car-free village.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

Carved initials which are nearly 500 years old preserve the deposed Queen's presence at Hampton Court Palace.

Ancient human remains unearthed around the iconic monument.