Amsterdam's former hotspot for public executions and dissections.

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

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

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

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

A public urinal so pretty, it was declared a national monument.

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

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A private garden of sculptural eccentricities.

Walk through living pictures and music in the Cathedral of Images.

A tiled, multi-level garden of survival in Lyon.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

Hundreds of hidden passageways weave through the old quarters of Lyon.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

This bridge was constructed from the rubble of the infamous Bastille.

Site of a classic 19th-century physics experiment to prove the earth is rotating.