This work of art, which took 35 years to complete, has a motorway running through it.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This church sits upon a peaceful hill and a long, turbulent history.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

This magnificent church allows travelers along one of Germany's busiest roadways a chance to rest and reflect.

Relics from as far back as the 16th century are on display in a city known for its playing card industry.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

One of only two commuter aerial tramways in the United States.

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.

The home of the first American-born saint is one of the only curved buildings in New York.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Walk into the 19th century without leaving Brooklyn.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

Sniff the Titan Arum's rotting flesh.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The flagship building of an early national restaurant chain is a superb example of terra cotta art.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

An alchemist's “magic door” stands in the middle of a Roman park.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

Fantastic views and thousands of love locks.