A tiny slice shop hides down an unmarked hallway in a Las Vegas casino.

This chimerical bridge/tunnel appears to dead end right into the sea.

Six beautiful wooden giants are hidden around Copenhagen.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

The last Viking king of Denmark is buried inside the crypt of this cathedral.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

A solid steel plane designed to catch fire over and over again.

This Indiana walk of fame honors music legends with record-shaped plaques in the pavement.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The former hotel where Tesla invented the radio.

An antique cemetery in New York, this land is home to any number of famed corpses.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

A collection of the best toys ever made inside a museum devoted to play.

Comprehensive gaming collection of over 30,000 electronic games and consoles.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A bit of retro transportation flair preserved in the world's largest department store.

This replica of the Greek structure is in the heart of Nashville.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This majestic tree has survived 400 years of storms, droughts, and floods, and is a beloved natural landmark in Missouri.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.