This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

The seat of Buffalo government is a gorgeous Art Deco palace.

This restored house is like a time capsule of the president's unconventional inauguration.

The place to be if you love vintage Swedish cars.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

An abstract monument to a symphonic composer.

A subterranean house of worship carved right out of the bedrock.

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

Copenhagen's celebrated theme park and gardens.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Twisted buildings adorn the banks of the Rhine river.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The romance of early commercial flight still fills this Art Deco destination.

There aren't too many operational funiculars around, but Pittsburgh has two!

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

A retrofuturistic art installation in the Pittsburgh Airport.