The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

This 18th-century folly is one of Europe's rare "garden mosques."

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

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.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The best place in the world to buy tinned fish.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

It's always game time at Stockholm's only museum devoted solely to video games.

A Wisconsin kitsch palace from the 1930s lives its second life in 21st-century Brooklyn.

A monument stands to the famous suffragist who penned the declaration for women's equal rights, including the right to vote.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

The famous author's cottage hideaway.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Crawling into this primordial cave may feel disconcertingly familiar.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.