Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Central Europe's largest collection of mini-bottles is on display at this museum devoted to a bitter Hungarian liquor.

This unique Lady Liberty is one of the only examples of the figure sitting down.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

Hundreds of hidden passageways weave through the old quarters of Lyon.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A unique underground structure dating back to the 1st century BC.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

This massive blockhead sculpture hides an entire library.

A chapel on a volcanic core, marking the end of a successful journey.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A Gothic cathedral created from volcanic rocks.

Geothermal waterfalls in Tuscany.