This building holds the embalmed remains of the leader of the Bolshevik Revolution.

World's largest bell sits on the grounds of the Kremlin in Moscow.

A monumental toilet that is also host to rare plants.

A taxus-tree to which Julius Caesar reputedly tied his horse.

This memorial museum chronicles the apocalyptic destruction of the First World War.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This huge limestone slab is considered the largest paving stone in Belgium and a relic of the earliest modern paving in Brussels.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

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

The former headquarters of history's oldest megacorporation.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

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

A set of seven houses, each built in a style that represents a European country.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Amsterdam's former hotspot for public executions and dissections.

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

This unattributed sculpture in Amsterdam is hiding in plain sight.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

A beautifully eclectic mix of architectural styles.

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

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Resting peacefully between two majestically-slanted trees, this roadside water trough circulates water peacefully.

A German shoemaker-turned-folk-hero whose impersonation of a Prussian military officer earned international notoriety.