One of the figures in this Celtic sculpture continues to puzzle archaeologists.

It's a mystery why these remains were found with no traces of their bodies in sight.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A living memorial to the trees London lost during the Great Storm of 1987.

Though this large circular site is now named for the legendary king, its history dates back to the Neolithic era.

An impressive Neolithic henge with banks nearly 10 feet high.

The largest terracotta fountain in the world, built to commemorate Britain’s Victorian achievements.

This two-legged horse statue celebrates a beloved cartoonist and his quirky characters.

This ancient holy well is older than much of the city that surrounds it.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

In the depths of Glasgow Cathedral's crypt, one pillar stands out from all others.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

This postmodern apartment block was designed to be a vertical neighborhood.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.