A floating cat sanctuary on an Amsterdam canal.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

One part local history, 99 parts gruesome haunted house.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A stunning Victorian abbey and walled garden on a lakefront.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

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

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

The ancient tomb acts as a calendar that keeps perfect time.

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

A museum dedicated to the history and exploration of both popular music and science fiction.

Granting the right of way to ships over surface traffic since 1917.

The final resting place of one of the most sensational guitar players of all time was created only after his father got the rights to his music.

The longest and widest floating bridge in the world.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

This spectacular track has run continuously since 1882.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

When ecosystems collide in the arid Southwest.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.