A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

A memorial to a dog that inspired rioting in the streets of London.

A little slice of Japan and its aesthetics in London's Holland Park.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

An unassuming rod in the Netherlands was once the old standard unit of length for the entire Dutch empire.

Science meets wall art to highlight the beauty of famous mathematical equations.

Amsterdam's former hotspot for public executions and dissections.

The ruins of New Zealand's largest classical-style church.

Pablo Neruda's custom-built lover's nest was made to remind him of the sea and named after his mistress' hair.

Two thirds of this Montreal neon icon has survived to flash another day.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

Every year, the colorful murals of Montreal get a complete makeover.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Largest illuminated advertisement sign in the world.

A display of hand-built replicas of the legendary vessels used by Patagonian and Antarctic explorers.

A market built atop boats is one of the few floating holiday markets in Europe.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

Collection of fossils, plants, and ancient animals encased in amber.

After Christopher Columbus died, his son built a fancy house to rule from.

Home to the world’s oldest seismograph and a four-ton steel ball that makes its own earthquakes.

The man who gave his name to magnetic measurement is buried in the city where he did his best work.