The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

Visitors flock to see this church tower's unintended feature: It happens to resemble a giant chicken from multiple points of view.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

A meow-velous tribute to a beloved street cat, made famous on the internet.

This shuttered power plant is now Turkey's first industrial archaeology museum.

The ornate miniature mansions were built for Istanbul's feathered residents.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This unique temple complex remains off the typical tourist trail.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

For one day every month Barcelona's Estació de França transforms into a market for model trains.

A beautiful but toxic fountain of mercury.

An architect transformed this abandoned cement factory into his castle-like workshop.

A surrealist labyrinth and museum of contemporary sculptures.

This semi-secret storybook hedge maze is also the oldest garden in the city.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

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

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.