Some of the greatest minds in the history of Hungarian art and science converged in this café.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Legends surround an ancient tree trunk riddled with nails for good luck.

Baroque celebration of the end of the Great Plague of Vienna.

A magnificent collection of imperial armor and weaponry.

The beautiful baroque library of the Hapsburg empire.

A museum dedicated Germany's favorite drink and most well-known festival.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

There has been an astronomical clock on this spot since the 14th century.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

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

An unassuming music museum recounts the rags to riches story of a dramatic Portuguese genre.

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

One of the smallest bookstores on the planet.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

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

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.”

The world's oldest bookshop still in operation.