Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

The second oldest continuously operating bar in Louisiana.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

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

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The fairy tale castle of the "fairy-tale king."

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

It's good luck to be mocked by this monkey.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Go inside to really appreciate this 500-year-old technological masterpiece.

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

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

This curious, round temple is the oldest still-standing marble building in Rome.

This ancient market is often referred to as the oldest shopping mall in the world.

This large, circular tomb is the final resting place of the first emperor of Rome.

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