Pilgrimage site for star-crossed lovers.

Go inside to really appreciate this 500-year-old technological masterpiece.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A small but immensely extravagant palace built by the "Night King."

A museum dedicated to the history and exploration of both popular music and science fiction.

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

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

Legend holds eating just one of these black eggs can add seven years to one's life.

Once a black market electronics marketplace, now an otaku shopper's paradise.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

Museum dedicated to the terror regimes of Hungary.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Home to three historic ships from the age of Vikings.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

The palatial McDonald's that inspired Wesley Willis.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.