Did Inca children also slide down these smooth rocky slopes above Cusco?

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Huge stone depressions which may have acted as an Incan agricultural experiment.

An unexpected desert oasis in South America.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

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

This monument is a stark reminder of the horrors of the Zanzibar slave trade.

In Zanzibar, a historic 19th-century palace is a reminder of the world's shortest war.

Freddie Mercury's childhood home is now a monument to the iconic Queen rockstar.

Sitting atop a rock on Michamvi Pingwe beach, this restaurant becomes its own island at high tide.

Traces of the thriving lake trade that once linked the Soviet Union with Mongolia.

A beloved tribute to the Fab Four and the freedoms they inspired.

History, geography, and shamanism meet in this eye-catching monument to the greatness of three empires.

Dinosaur eggs were first discovered at these fiery red cliffs.

An institution dedicated to curiosity, logic, riddles, and Mongolia's long history of puzzles.

A jagged silhouette of shamanistic stone heaps rises from the shore of this dazzling mile-high lake.

The oldest Buddhist monastery in Mongolia has survived centuries of invasions, political shifts, and religious purges.

Enormous statue of the Emperor of the Mongols.

Stockholm's narrowest alley is barely over two feet wide.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.