Check the time in 145 countries at once with this East German relic.

This public observatory is home to the "celestial cannon," the longest pointable telescope in the world.

This monumental work of art symbolizes the coming together of a previously divided city.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Started as a kitchen garden, now the second largest botanical garden in the world.

A portable, wooden replica (minus the hyphen) of Hamburg’s iconic crooked coffee shop.

One of the few Tudor palaces in Germany, which hosted a historic WWII meeting.

A bizarre representation of our ever forward moving society.

A second hand shop that enabled the plan of Germany's most iconic conman.

If you visit the burial place of King Frederick the Great, you'll likely find a couple of potatoes sitting on his tombstone.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

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.

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

The devil-defying mark left by a saint as a boy is visible inside Lisbon's cathedral.

Eat the ultimate iteration of Portugal's most beloved pastry.

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

The world's oldest bookshop still in operation.

The scorched Lisbon church that survived two earthquakes and a massive fire.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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