One of several Lilliputian portals that are ready to transport passengers to other dimensions, if they can find them.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Near the site where the English Archbishop was born, you can find an emblem in the shape of a pilgrim's badge.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

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

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

At just 51 feet and 10 inches long, it's the shortest street in England.

This suburban British town holds secrets that would have made the druids proud.

A life-size replica of a Spitfire that sits in a quaint suburb.

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

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.

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.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

Rolling sand dunes of the Sahara... in the middle of the Atlantic Ocean.

The old ceramics factory on Boa Vista shows the power drifting sand has to destroy buildings.

This curious sculpture represents the perseverance needed to take to the skies.