Believe it or not, the now-ubiquitous California avocado originated in Guatemala.

It's not quite as old as its Roman appearance suggests, but this piece of infrastructure served Guatemala City for centuries.

Constructed on the ruins of a convent, this tower saved countless lives.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Walk 2,300 feet above the ground on the "Troll's Tongue."

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

This huge green space packed with activities will make you forget you're in the middle of the Ecuadorian capital.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

Home of the "true" equator.

Quito's historic, main square dates back to the 16th century.

The world's tallest aluminum statue is also the world's tallest image of a winged Virgin Mary.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

A permanent outdoor art installation made up of more than 100 mushroom-shaped lights.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Between a bike path and the South Platte River sits a piece of modern space history.

An innovative local park built from an abandoned sewage treatment plant.

This swanky speakeasy is Denver’s oldest bar—and hasn’t changed a bit since 1933.

In a small Japanese garden off a busy Denver street, a memorial to a brave, principled politician.

A unique auditory experience right on the sidewalk.