A subterranean shelter remains intact under a busy Paris railway station.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

The former home of Norway's greatest romantic composer.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A floating cat sanctuary on an Amsterdam canal.

Not actually a shop, but one fan's passionate show of support for a rival county's Gaelic football team.

A gated cross stands on the site where an Irish revolutionary met his end.

This World War II relic let Allied pilots know they were entering neutral airspace.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This doorless 20th-century elevator doesn't stop or slow down.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.