This Russian religious complex is a Frankenstein's chapel that includes influence from almost all the major faiths.

The summer tourists on these cliffs are thousands of seabirds.

This black church sits alone among a field of lava rock.

This elegant arc of a waterfall marks a religious turning point.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Gargantuan home of Russian science.

Stalinist skyscraper built with help of cryotechnology.

The tallest hotel in Europe.

World's largest bell sits on the grounds of the Kremlin in Moscow.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

Once America's tallest structure, now a Baltimore landmark.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

America's first federal monument.

Two thousand artifacts from around the world collected by one woman who loved to travel.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

The museum moved on, but the diorama remain.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

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

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.