The world's oldest and largest museum of mass transit vehicles.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The naturally mummified body of a peasant girl saint.

Fortified medieval tower house with lovely roof garden.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

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

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

Fountain where visitors can earn a license to be mad.

The venerated body of a 12th century saint is celebrated each year with the 'Race of the Candles.'

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

This is the oldest Roman-made bridge in the city still existing in its original state.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

This monumental fountain has moved around the city multiple times.

The house where the writer spent his formative years.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

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

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

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

The oldest public library in Ireland.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.