Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A tilted half-timbered house from 1672 is built into a salvaged segment of a medieval wall.

A stunning two-story timepiece within a medieval Brick Gothic church.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

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

When the Soviets destroyed the historic Armenian monastery they somehow left its bell tower intact.

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

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

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

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

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

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

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

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

One of South America's most exclusive resorts has a storied history dating back to World War II.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

Of five volcanoes located in the massive Tengger caldera, this cone is the youngest and most active.

Located on the campus of Emory University, this museum is filled with objects from the Americas to ancient Greece.