The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

When flour explodes, it's not a pretty sight.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Ever wanted to can Spam?

A tunnel with windows, so you don't miss out on the impressive views.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The fifth-longest natural arch in the world, and the longest outside China.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

The largest island on the great salt lake is home to curious creatures and strange stories.

Dozens of rockets and missiles are on display outside a testing facility in the Utah desert.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

Famously misunderstood wonder of the ancient world

The largest stone circle in the world has ended up bringing up more questions than it has answered.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Erotic art covers the walls of the largest ancient pleasure palace.

The walls and streets of the ancient city are peppered with penises.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

What was once a unique system of urban elevators is turning into a mechanical ruin.