Catacombs turned marketplace.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The trials and tribulations of marking Poe's grave.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Quite simply the largest tree in the world (by volume).

Remnants of a storybook amusement park hidden behind a strip mall.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A student driver's nightmare.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Macabre astrological automaton clock dating to the late 1400s.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Famously misunderstood wonder of the ancient world

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."