Climb inside an iron crystal magnified 165 billion times its normal size.

A marvel of Byzantine engineering under the streets of Istanbul.

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

A battle between nature and architecture in the Cambodian jungle.

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

The most famous location in China was home to whole dynasties worth of imperial rulers.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

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

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

Eighty million natural history specimens call this gargantuan museum home.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Macabre astrological automaton clock dating to the late 1400s.

Plagued by riots, celebrity injuries and a tragic death, this amusement park has been demolished.

An art museum with an eclectic design and a scandalous past.

Try not to get lost in this picturesque Brazilian labyrinth of the dead.

This Brazilian palace island was once the site of the last grand ball before revolution.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

The largest library in Latin America owes its existence to an Old World earthquake and a Napoleonic invasion.

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."