A monument to the three wars that led to German unification towers within a Berlin traffic circle.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

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

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Residents of Berlin take their coffee and cake in one of the city’s most restful spaces: a cemetery.

The metal-free wooden towers of Brück.

One of the most photographed locations in the entire city.

This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

A former factory serves as a shrine to the industry that sustained Santorini for decades.

After a catastrophic forest fire, a Greek artist transformed scorched tree trunks outside an old sanatorium into this haunting sculpture garden.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

Legend says this sacred tree was a gift from goddess Athena.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

The castle where Martin Luther secretly translated the New Testament from Greek to German while in hiding.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

This conical hill was built as a testing ground for an engineer known as the Glider King.

Super-heavy Nazi architectural experiment.

The final resting place of many of Germany's most famous communists.

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

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.