Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

New York's oldest magic store.

Try not to get slimed in Tribeca.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

Experience what life was like in Ireland during the Viking and medieval ages.

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

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

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

One of Ireland's most infamous prisons for rebels including men, women and children.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The secret medieval communication system will whisk your words above the noise of the crowd.

A Milanese café entirely designed by the American director Wes Anderson.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

The patron saint of spinsters grasps a container of dried blood.

The footprint of a frustrated devil in Munich's Cathedral.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

This medieval church is not only notable for its architecture, but also its connection with LGBTQ+ history.

When the plague struck York, this stone was used to leave supplies for the sick.

A giant piece of cutlery designed to remind us about the origins of our food.