Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Space-age monument to an early 20th-century uprising.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

A small monument in Lithuania marks the geographic center of Europe—or at least one of the claimants.

A curious art park at the geographic center of Europe is home to 3,000 television sets and other wonders.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

A black cat protests the City Guild in Riga's Old Town.

3,000 market stands in five former Zeppelin hangars.

Flamboyant architecture from the turn of 20th century.

A gorgeous medieval library where the books are kept in chains.

A sulfuric hellscape in southern Italy.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

Cave shrine on Monte Pellegrino.

Thousands of well-dressed mummies below a monastery.

The oldest botanical garden in the world that technically isn't the oldest.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

This picturesque Umbrian city has a subterranean side that has long remained hidden.