This massive rock balanced for thousands of years being tossed here during a volcanic eruption.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

A 16th-century horror show built in a lovely Italian garden.

This network of roads is one of the most unique Etruscan creations ever discovered.

This virtually windowless mass of smooth concrete is the only Catholic church in the city.

Where the lovelorn find a home for their sentimental keepsakes.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

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

The charmingly disheveled clock tower of Tbilisi's puppet theater.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Hidden in plain sight, this lush garden sits atop one of the most iconic buildings in São Paulo.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

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

Despite being tiny and rural this Georgian airport looks like a sci-fi boondoggle.

Fast food feels like fine dining at this award-winning modern Georgian building.

The first skyscraper to include a Ferris wheel built into the facade.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Fortified homes of highland warriors that are still in use today.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

Unusual building appears to be haphazardly built from randomly piled bricks.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.