The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

This spooky statue sits outside a famous Prague theater.

Along this wire fence, travelers have been leaving a particular memento since 2012.

Iceland's tribute to its thankless civil servants.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This stunning concert hall has become a symbol of Iceland's national recovery.

Three columns of volcanic rock shoot out of the ocean.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

This landmark cemetery in Boston was created more than 300 years ago.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The site of Paul Revere's historic two lantern warning.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

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.