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

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

This famous archeological mystery may be an ancient example of movable type.

100 year tradition of fist fights, marked by marble footsteps.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

360° views of the city plus five floors of optical illusions and hands-on science.

This small museum in a 17th-century building honors three iconic Scottish writers.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

A piece of stonework relief commemorates the site where the Devil's rage, and odd apparel, destroyed a house.

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

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

A book bound in the skin of an infamous criminal, along with countless other specimens.

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.