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

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

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

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

The bronze uniforms commemorate the vital role of women during World War II.

A mysterious shape catches the eye in this 16th-century painting.

One of the oldest remaining Catholic churches in England is home to the hand of a 7th-century saint.

One of the shortest streets in York has an especially odd name.

Makers and sellers of the original and finest York Ghosts.

This sculpture marks the spot where one of the greatest Roman rulers was proclaimed emperor.

Follow the original medieval paths that wind through this intriguing section of the city.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

The sign at the garden gate reads: "These Plants Can Kill."

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

Plans for this peninsula included houses, the United Nations Headquarters, and a nuclear power plant. When none of them worked out, it became an expansive park.

The site of Paul Revere's historic two lantern warning.

A collection of full-size movie monsters opened to the public.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

Oldest church in the United States that is still in continuous use.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.