An exquisite Baroque church in Vienna's old town.

The solemn exterior conceals an opulent interior of this 17th century church.

A silly medieval mural preserved on the side of a Viennese house.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

Apartment complexes built into huge repurposed natural gas tanks.

Dedicated to the man who saved hundreds of children from Nazi-occupied Czechoslovakia.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

This spooky statue sits outside a famous Prague theater.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

Collection of nearly 500 concrete figures sculpted by the late Veijo Rönkkönen.

A medieval village, with red wooden cottages around a stone church, stands as a well-preserved example of a settlement type that was once common in northern Sweden.

A gathering of green robots at the Googleplex.

On Nobel Street, a miniature statue of Alfred Nobel.

Underground monastery and fortress.

Hidden up a dusty track off the Georgian Military Road is this fascinating waterfall with mountainous views.

Georgia's answer to Easter Island immortalizes the nation's great poets, artists, and leaders in stone glory.

The oldest ruins at this castle overlooking Georgia's Terek River Valley date back to the 10th century.

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

The apartment where Pippi Longstocking came to life.