Go inside to really appreciate this 500-year-old technological masterpiece.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The celebrated eyesore created by starry-eyed sweethearts.

A fantastic castle rumored to be the birthplace of King Arthur.

Famously misunderstood wonder of the ancient world

The most playful of the life-sized statues that make up Singapore's "People of the River."

Singapore's landscaping project is home to 18 incredible Supertrees.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.