A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

The only monument to name all of the passengers and crew who died on the RMS Titanic.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

The rare American Civil War-era weapon was never fired in anger.

The study has wall paneling from a 17th century ship.

The modern birthplace of Irish freedom.

A memorial sculpture to heath hens stands on the spot where the last heath hen, Booming Ben, was last seen.

This graveyard boasts a medley of diverse and imaginative funeral architecture.

The oldest certified bowling alley in the United States is in the basement of this century-old bar.

A beautiful midcentury mural by the famed Brazilian modernist artist Emiliano Di Cavalcanti.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

Deadly airliner crash preserved for those willing to climb and pay respects.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

A statue honoring 44 continuous years of greeting passing ships.

Amsterdam's former hotspot for public executions and dissections.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Survival capsules find a second life as a unique hotel.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

The attic of a four-century-old canal house hides a clandestine church.