Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The "dragon babies" of southeastern Europe.

A miniature train-ride through Slovenia's largest cave system.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

Structure built from the skulls of vanquished foes.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A whimsical bridge adorned with decorative dragons.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

An underground city of salt.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

A 125-meter long "tribute to the Brazilian people."

These small sculptures pay homage to the lovable star of an iconic Argentine comic strip.

The final resting place of the liberator of Argentina is guarded around the clock by two soldiers.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This stone complex marks the urban center of a lost civilization.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

A monument to the conquistador became increasingly controversial in the very city that he founded.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.