The first memorial dedicated solely to the Black troops who fought for the Union.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A secret greenspace hides atop a Capitol parking garage.

One of the last remaining movie theatres in the country that features a rear-projection system.

A 300-kilogram egg sculpture that embodied a neighborhood revival.

Plaques celebrating Lithuanian writers freckle a wall of this picture-perfect path.

This magnificent Art Deco church is a reflection of Lithuania’s turbulent history.

Where a Japanese government official issued transit visas to Jews fleeing from Nazi-occupied Poland.

This striking structure is the Socialist-modernist centerpiece of a former Soviet spa resort.

An abandoned masterpiece of Soviet Brutalist architecture.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

New fungal and bacterial species call this deadly lake home.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A unique geological area spiked with wind-carved rocks that resemble teepees.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.