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.

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.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The incredible private taxidermy collection of an eccentric zoologist.

The European Union’s tallest freestanding structure provides radio and television broadcasting to half of Latvia.

A stunning modern interpretation of a Roman temple.

A storied British pub where customers leave messages in the walls.

One of Mother Nature’s geological gems, home to many prehistoric fossils.

Underground tunnels once home to crime are now back open to the public.

This buzzy, award-winning building hovers 85 feet above the ground on a dozen colorful stilts.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A unique subway station where pillars evoke ancient civilizations.

The remains of the oldest bone-headed dinosaur in North America.

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

The last vestiges of a magnificent Victorian-era train station can be found in this pub.

Take in the views of Big Ben with a Guinness in hand at this floating pub aboard a 1930s Dutch barge.

Once a 19th-century refuge for immigrants, this pub has hosted performances by Amy Winehouse and the Arctic Monkeys.

These former ticket office windows in London's underground now house pocket-size parks.

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.

This statue of one of the engineers who created the London Underground hides a ventilation shaft for the tube lines that run under the street.

This hydraulic power system in London was, at one time, seen as a rival to electricity and the last of its kind to shut down.