Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

Strolling through these vintage locomotives offers a surprising amount of insight into the history of Kenya.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

This beautiful site is where the first transatlantic telegraph was sent from.

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

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

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

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

These imposing walls and towers look more like the ruins of a fortress than a monastery.

The modern birthplace of Irish freedom.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

The skeleton of a whale that beached itself in this Irish town is now on display in their public park.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

The oldest public library in Ireland.

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

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

The famous aviator's final resting place is a study in natural beauty.

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

A wonderful and easily overlooked museum tucked in Ohio's Burke Lakefront Airport.

The world's oldest continuously operating airport was founded by the Wright Brothers.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.