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

This extraordinary, multi-pillared monument depicts the fascinating history of Georgia.

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

A lively circle of dancers in the Georgian capital commemorates an ancient rite of spring.

With over 10,000 lights, this engineering marvel lights up the city after dark.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

This strange statue features a bust of the famous composer plopped atop a woman's body.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

The medieval network of canals hidden underneath the city is opened to explorers each year.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Water mills built into a cave in the 17th century are powered by a subterranean river.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This amazingly preserved Doric temple was abandoned before it was ever completed.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

This statue intended for children to enjoy became a minor political spat.

A pair of antique trolleys are on display at one of the oldest subway stations in the United States.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

This mosaic commemorates the oldest subway tunnel and station in the United States.

Dedicated to a colonial woman who was hanged for being a Quaker.