A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

This massive library holds what was once the largest book collection in the world.

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

A stone circle on the slopes of a Caribbean volcano commemorates the leader of an anti-slavery uprising.

A Caribbean chef recreates his enslaved great-great-grandmother's dishes inside the home she purchased after buying her freedom.

The interior of this church has been turned into a memorial to locals who died in Croatia's Homeland War.

One of the very few mosques built by the Ottomans still standing in Croatia is now a Catholic church.

The local club's soccer field is practically surrounded by UNESCO-protected monuments.

This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Longest fortress system anywhere in Europe.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

Where the lovelorn find a home for their sentimental keepsakes.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

This work of art was designed to represent the Tarpeian Way Quarry that once dominated the area.

Come for the flowers, stay for the bats!

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

A beautiful but toxic fountain of mercury.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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