Bacteria and algae give the salty water its bubblegum hue.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A living lighting fixture.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

Artists and musicians now rule over this former rail station.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

Dictionary Johnson’s favorite feline.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

An architectural oddity hides in plain sight on this iconic London bridge.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This colorful statue welcomes visitors to a Barcelona park.

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

Week-long block party becomes a competition for the best decorated street.

For more than half a millennia, this automaton has rung an hourly bell.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

A breathtaking and biodiverse wilderness in the mountain setting of Ernest Hemingway's "For Whom the Bell Tolls."