An exquisite Baroque church in Vienna's old town.

The solemn exterior conceals an opulent interior of this 17th century church.

Macabre astrological automaton clock dating to the late 1400s.

Baroque celebration of the end of the Great Plague of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The final resting place for the remains of 143 Habsburg royalty.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

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

Fantastic views and thousands of love locks.

The telescope that discovered Neptune.

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

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The "lovely red Vega" of the legendary record-settling pilot.

Largest Roman Catholic church in North America.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

One of the largest underground systems runs under Canada's largest urban center.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

Watch the ships come in on Michigan's 210 ft. high observation deck in Sault Ste. Marie.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.