An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

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

Ruins of two abandoned stations destroyed by the power they sought to harness.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

A small collection of magic tricks and memorabilia is now an apartment-sized museum.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

The painter of "The Scream" is laid to rest under a stoic bust of himself in the humble corner of an Oslo cemetery.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Home to three historic ships from the age of Vikings.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

Walk 2,300 feet above the ground on the "Troll's Tongue."

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

The world's only museum devoted to the wonders of fluorescence.

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

Things aren't quite what they seem at this mind-bending museum.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Venice's "Island of the Mad."

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.