This fantastical waterfall is hidden in a cave located in a cracked cliff.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This garden houses the remains of the ancient Greek port of Marseille.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

This massive library holds what was once the largest book collection in the world.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This Finnish town on the Arctic Circle is trademarked as the Official Hometown of Santa Claus.

Finland's northernmost zoo is home to the country's only polar bears.

Finland's oldest astronomical observatory once played a crucial role in seafaring and timekeeping.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Macabre astrological automaton clock dating to the late 1400s.

Two stunning 17th-century libraries and a cabinet of curiosities.

Construction of this bridge was once described as an "act of violence" against a neighboring country.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

This 135-year-old weather station studied the effects of the climate on human health.

An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.