A boulder carved into the shape of the cosmonaut's head.

This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

The world's largest and most outstanding marl lake regularly changes color.

The world’s largest work of glass art hides in this stunning Taiwanese subway station.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

Of course the grave of JFK's assassin is surrounded by conspiracy theories.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

A shining, cold, black organ lies in San Francisco's financial district.

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

In the northernmost city in the world, it's illegal to be buried because it’s too cold for bodies to decompose.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The two writers famously didn't come to blows over the Oxford comma.

This large midwestern cavern features impressive rock formations and an underground waterfall.

During the holidays, a vintage subway train whisks New Yorkers back in time.

What was once the largest NFL stadium.

A century-old network of freight tunnels underneath the city's historic business district.

A World War II officers' club features Old West murals painted by German POWs.

The streets of a sleepy Spanish town proudly exhibit some of the world's finest graffiti.

A mysterious "wedding cake" castle in the middle of the urban desert.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.