The city’s oldest gateway to the galaxy lies at the entrance to the Royal Botanical Gardens.

Come for the flowers, stay for the bats!

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

This 600-year-old home seems to defy physics.

The prototype for all Nazi concentration camps.

The fairy tale castle of the "fairy-tale king."

Spiral alpine structure provides an alternative experience of viewing the Matterhorn.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

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

Giant marble phalluses on the sacred island of antiquity.

For over 300 years this little carving has been the city’s good luck charm.

Perfume museum and library.

The construction of a tram line unveiled hidden remnants of the old medieval city.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

An architectural oddity hides in plain sight on this iconic London bridge.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

An unusual round church in London with a Templar past.