This group of small islands on Lake Nicaragua formed after an eruption of the Mombacho volcano.

The crumbling remains of a once-grand building.

Dating back to 1812, this is the oldest racecourse in the Southern Hemisphere.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

A little sculpture with a large wardrobe.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.

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

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

Constructed during the 7th century this is one of the oldest largely intact Christian churches in England.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

One could not be blamed for literally walking all over this supposed landmark.

5,000 skulls in memorial to those killed by the Khmer Rouge.

340-foot statue built to honour the Heroes of the Soviet Union.

A unique museum dedicated to culture and artistry of carpet weaving.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

A large collection of steam engines, organs, and fairground attractions.

This medieval castle is filled with an eccentric collection that ranges from ancient Egyptian artifacts to taxidermy to a mummified hand that was cut off during a duel.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Eighty million natural history specimens call this gargantuan museum home.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.