Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This ship offers visitors the chance to spend the night aboard a former floating hospital for fishermen.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

An abandoned masterpiece of Soviet Brutalist architecture.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

The largest coin pyramid in the world is a carefully balanced stack of over 1,000,000 pieces.

The Guardian of Tallinn.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's narrowest alley is barely over two feet wide.

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

A king's bloodstained shirt is among the gruesome collection of artifacts displayed below Stockholm's Royal Palace.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Most prolific publishing house in the 1600s open to the public.

A man throwing a giant severed hand towers over Antwerp’s main square.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

Climb inside an iron crystal magnified 165 billion times its normal size.

Theme park featuring miniature replicas of European monuments.

When you're a great Russian Tsar, even your vomit gets a statue.