A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Europe's official "zero-level," the equator of elevation.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A beautifully eclectic mix of architectural styles.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The history and future of cannabis.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Amsterdam's former hotspot for public executions and dissections.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

The reconstruction of this prominent building fulfilled a long-written command.

Flamboyant architecture from the turn of 20th century.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

This Great Dunmow pond was a breeding ground for medical leeches, as well as the testing ground for the world's first lifeboat.

After protestors toppled a statue of a 17th-century slave trader, the pedestal where it once stood remains unoccupied.

An ornate doorway leads to the former site of one of the city's oldest society of merchants.

This Grade II Listed Building with an Art Nouveau façade once contained a unique print shop.

It houses a menagerie of wondrous taxidermy specimens from around the world, including the remains of a famous gorilla.