This exhibit pays tribute to the “humble tinkerer” who invented the implantable pacemaker.

A remarkable lava formation encloses a line of Buddhist statues that can't be accurately counted, according to local mythology.

This long-distance walking route follows the Prime Meridian line as it passes through England.

A serene desert oasis speckled with ancient artifacts.

The home of Ireland's last leprechauns is officially protected by the European Union.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

These quintessentially English stepping stones were built for Victorian tourists.

The longest manmade tunnel in Queensland is now a beautiful trail, home to a special colony of bent-wing bats.

This mountain trail inspired Nietzsche to complete his magnum opus.

A breathtaking 19th-century trail overlooks Lake Tahoe.

This trail follows unique stone railroad tracks and a historic waterway to the south coast of Devon.

This harsh mountain path was built as a strange attempt to improve the health of Turkmen citizens.

The longest non-mortared wall in the country is one man's tribute to his displaced Yuchi ancestor's five-year journey to her homeland.

A dictator's failed public works project has been reborn as two linked trails through spectacular scenery.

A trail weaves through the verses of a poem illustrated by stone sculptures inspired by Native American pictographs.

A winding medieval path was used by mourners to carry their dead to the nearest church.

A series of 33 stone markers maps an ancient 55-mile transportation route.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

This East German military command bunker was ready for World War III.

In the land of the Light Brigade stands a testament to the Cold War.

A Cold War command center is hidden under an idyllic countryside.

One of the most horrible legacies of the Cold War is a site where the Soviet Union tested nuclear bombs on civilians.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.