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

Over several decades, one of London’s most iconic city gates was dismantled, moved out of the city, and then moved back.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

A cluttered and astounding collection of antiquities and curiosities.

The anatomical-pathological collection of a man who changed surgery.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

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

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

Inside this Krakow church, an explosion of psychedelic color.

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

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

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

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

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

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

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

Eastern Canada's ocean playground.

A stone nook where Frederick Douglass escaped the world to think, read, and write.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

This fortress was built using the last surviving stones from the Lighthouse of Alexandria, one of the Seven Wonders of the Ancient World.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.