The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Macabre astrological automaton clock dating to the late 1400s.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

A battle between nature and architecture in the Cambodian jungle.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

A quick and simple solution to Cambodia's train woes.

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

This $62 million dollar temple was erected to house one little dental fragment of religious history.

Singapore's landscaping project is home to 18 incredible Supertrees.

More than 200 statues filled with cryptic symbols give this park spot an aura of horror vacui fantasy.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

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

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

Famously misunderstood wonder of the ancient world

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

The most loyal of little dogs, or a Victorian era publicity stunt?