A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

This striking sculpture of Icarus honors Greece's fallen flyers.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

Rumors of the occult haunt this upscale 1920s hotel.

From horses to stainless-steel trucks, this iconic Providence burger wagon is one of the oldest mobile diners in the country.

The busy transport hub is home to the tallest airport slide in the world.

Watch butterflies take flight before you fly.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

The stone sculpture of an Ottoman soldier is an homage to a lost Providence landmark.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

A memorial to the monk who set himself on fire to protest the persecution of Buddhists in Vietnam.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

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

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.