A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Every drop of D.C. tap water flows through this old waterworks.

During the holidays, a vintage subway train whisks New Yorkers back in time.

This working class sculpture pounds his hammer all the livelong day.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

A shining, cold, black organ lies in San Francisco's financial district.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

A small Richmond island dotted with the remnants of hundreds of years of history.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

The first Russian Orthodox church in North America and an Alaskan landmark.

Walk through Czech history in Prague's largest graveyard.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

The most accurate timepiece in the world.

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

The likeness of the Baltimore music icon was unveiled in time for the anniversary of his Senate hearings on music censorship.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.