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

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

These unique and ever-changing caves are a wonder of Iceland.

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

Three columns of volcanic rock shoot out of the ocean.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

Its interior is adorned with some of the best examples of early Christian mosaics.

This curious, round temple is the oldest still-standing marble building in Rome.

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

A sculpture serving as an homage to Pope John Paul II.

The charred, dead skeleton of an oak tree is said to have consoled a dying 16th-century Italian poet.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

What appears to be an ancient Roman temple is actually a Catholic church.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

The final resting place of the poets Shelley and Keats.

An iron dragon with a long neck covered in feathery scales perched above one of Venice's most popular squares.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Two stone columns flank the grand Venice square, but there were supposed to be three.