Scattered throughout London are ancient remnants of the city's former bounding wall.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

London's smallest police station is barely the size of a phone booth.

Eighty million natural history specimens call this gargantuan museum home.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The curios of pharmacist and collector Henry Wellcome.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A popular European tradition makes its way to the states on one of America's most famous bridges.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A subterranean house of worship carved right out of the bedrock.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Swedish skyscraper with a 90° twist.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A whimsical bridge adorned with decorative dragons.