A walk through the historic city center, under the streets of Seattle.

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

Whether or not you take the 72-ounce steak challenge, there’s plenty of history, fun and Texas-style food at this legendary stop along Route 66.

This landmark honoring a local beer brand is an iconic part of the Minneapolis skyline.

Named from the Spanish for “beautiful woods,” this public cemetery is spread across 29 acres of moss-draped oaks.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

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

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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

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

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

These spartan apartments are provided to clergymen visiting Vatican City.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

Breathtaking and huge 430 year old maps of Italy.

2300-year-old Roman road connecting the empire.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Copenhagen's celebrated theme park and gardens.

A unique bridge with an equally unique view.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

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

The reconstruction of this prominent building fulfilled a long-written command.