This inexpensive lodging house was once a prison notorious for its inhumane practices.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

These prehistoric replicas were based on actual skeletal remains.

These locks on North America’s oldest canal are named after a porcine rock formation.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

The world's first combination ski slope and power plant.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

Stockholm's tiniest statue is of a small boy looking at the Moon.

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

A wooden street sign is the last remnant of this 400-year-old alleyway.

Stockholm's narrowest alley is barely over two feet wide.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This contemplative sculpture made out of old machine parts is meant to be the first in a series of sculptures around the world.

Hans Christian Andersen for the postmodern world.

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

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Copenhagen's celebrated theme park and gardens.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.