Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Macabre astrological automaton clock dating to the late 1400s.

Steadily reminding Czechia of its past.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Go inside to really appreciate this 500-year-old technological masterpiece.

Venice's island of the dead.

The bears of Bern have been a city highlight for over 500 years.

This simple apartment may have inspired some of the most important theories in the history of science.

Monsters and miniatures are held in equal esteem at this wondrous museum.

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

Unable to build support structures on glaciers, the engineers for this tramway were forced to design a unique system.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

Home of the Large Hadron Collider and the birthplace of the World Wide Web.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

The world's longest known cave system.

The first full-scale tunnel built in America is short but scenic.

This replica of the Greek structure is in the heart of Nashville.

This is not your typical jungle gym.

Less a museum than a bizarre fantasy world created by artists and engineers.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.