A park where people have been going to feed friendly pigeons since the 18th century

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This colorful gate stands as an entrance to the walled city of Old San Juan.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Liechtenstein's royal family calls this medieval alpine castle home.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Remnants from a time before electricity.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Inside this Krakow church, an explosion of psychedelic color.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Breathtaking and huge 430 year old maps of Italy.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

A small cell adjacent to this church was once the bedroom for a renowned saint.

This ancient market is often referred to as the oldest shopping mall in the world.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

War prevented this Polish composer's body from being returned to his home country for 51 years. Though his ashes eventually made it home, his heart stayed behind.

One of the world's oldest continually operating bookstores.