This rare wildlife haven in Singapore feels like you're in the tropical rainforest.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

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

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Turkish adventurer antiques in the heart of the Grand Bazaar.

The celebrated eyesore created by starry-eyed sweethearts.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

This massive library holds what was once the largest book collection in the world.

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

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A museum of carnival attractions where you are invited to ride the rides.

Paris' linguistic guide to the international language of, yes, love.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

What once sat in the world’s spotlight is today a largely disused ghost complex.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

An autonomous republic of Orthodox monks.

An alien landscape on the banks of the Aegean Sea.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.