A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Started as a kitchen garden, now the second largest botanical garden in the world.

A flooded Mexican cave that hides a river beneath the water.

Montreal's colorful subway station shows its support of the local LGBT+ community.

A contemporary fresco movement illustrates the region's rich history.

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Where cemeteries are carved into the side of cliffs and infants are buried in the hollows of trees.

This Balinese sea temple is thought to be guarded by the hundreds of monkeys that live around it.

At first glance, little checkered structures on the hillside look like they house the living, not the dead.

This remarkable checkered church on a Corsican hilltop is fabled to have been built by angels.

Napoleon's childhood home is now open for people to explore the beginnings of France's short general.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Fortified homes of highland warriors that are still in use today.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

Unusual building appears to be haphazardly built from randomly piled bricks.