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

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

Cairns built to bring travelers good luck stretch across the land like miniature stone mountains.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

This elegant arc of a waterfall marks a religious turning point.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Jesus' footprints and the first catacombs in the world.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.