The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The oldest stone house in Paris was built by its most famous alchemist.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This ancient theater was once the home of fierce gladiatorial battles.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Every year, a sparkling cave is sculpted in the icy heart of a glacier.

A fortified palace in the shape of a ship on the Thiou river.

The world's largest reflecting pool is just two centimeters deep.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Strange physical sensations and optical contradictions keep visitors coming back for more.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

A museum dedicated to the exploring past, present, and future innovations.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

One of two giant blue cockerel statues erected with an intentional double meaning.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This landmark honoring a local beer brand is an iconic part of the Minneapolis skyline.

The only arched bridge made of stone on the entire Mississippi River.

Opened in 1956, the first modern indoor shopping mall in the world was inspired by the shopping arcades found in European cities.