Nondescript building owned by ExxonMobil working on siphoning Greenpoint Oil Spill out of the ground.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

A 13th-century fortified manor house that was once sieged during the English Civil War.

A beautiful, historic location open to the public.

This 6th-century church honors St. Tudno, the patron saint of Llandudno.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

This Roman arena once played host to bloody gladiatorial battles.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Dine like an American revolutionary at Colonial Williamsburg.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This coffee shop lies hidden beneath a historic church.

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

Built by George III to observe the transit of Venus, this Georgian gem is a unique survivor in the Arcadian landscape of Richmond upon Thames.