This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

An abandoned stretch of highway, deteriorating next to the operational one.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A road runs through the middle of this small Austrian chapel.

This one-time health resort was used by aristocrats around the world.

A miniature model of the iconic Stockholm department store.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

Locals rallied to save this beloved mural after someone mistakenly attempted to cover it.

This unique sculpture is often overlooked by pedestrians.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

Sound travels strangely in this underground whispering gallery.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

You may get stranded and everyone's peeing in the water, but at least there's cocktails!

The first official clock in North America, it kept time for the Spanish government of Santo Domingo.

Scandinavia’s largest shop dedicated to anything carbonated.

A hollowed-out baobab that became the horrific final resting place of leprosy sufferers, with gruesome evidence to prove it.