A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

This cemetery is all that remains of a school for "wayward" girls.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

World's second largest particle accelerator, where nature reveals its secrets.

Krakow's own version of the Hollywood Walk of Fame.

Seven dragon statues—including one that breathes real fire—are scattered throughout the streets of Krakow.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

Remnants from a time before electricity.

London’s first road overpass is so old that it was originally built for horse-drawn carriages.

A recreation of a sign that Charles Dickens used to see on his walk home.

The largest of London's subterranean rivers and once a mad, bad center of London life.

A mysterious shape catches the eye in this 16th-century painting.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

A jumble of concrete on the corner of one of London’s terraced buildings is actually a work of art.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A measuring mishap led to these artificial stone ladies losing their stomachs.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.