A memorial to the only dog ever officially enlisted in the Royal Navy.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

A unique work of automotive art calls this shopping center home.

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

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

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

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

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This cheese shop also houses a museum devoted to Dutch dairy.

The last of Amsterdam's original sea level markers remaining in place.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

A floating cat sanctuary on an Amsterdam canal.

The original goat tower, the one that started it all.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

An idyllic hotel that gave its name to a supposed shadow government.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

The cutest way to stay safe in traffic.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Atop this former dutch railway office sits an interstellar work of art.