The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

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

A twisted steel beam from the wreckage of the World Trade Center is the centerpiece of this memorial for those who died on September 11, 2001.

One of the largest squares in Europe contains an entire artificial island.

The oldest botanical garden in the world that technically isn't the oldest.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

This old medieval prison tower has been a site of astronomical research for more than 250 years.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

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

Turtles swim in a pond surrounding a classical temple in this lush park in Vicenza.

Oldest unrestored plantation house in America that is open to the public.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

This spooky statue sits outside a famous Prague theater.

Macabre astrological automaton clock dating to the late 1400s.

Art historians have debated the identity of this medieval stone rider since the 19th century.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.

A unique bridge with an equally unique view.

A famed artist's inspiring work of peace and tolerance.

This tremendous timepiece was once the largest cuckoo clock in the world.

A ruined castle stands atop a hill surrounded by dragon lore.