In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

The oldest dim sum restaurant in the United States is a nostalgic jewel.

University City's quirkiest resident lives in a park named after its first.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Eat your Big Mac in a DC-3.

These engineering masterpieces are a dominant feature of the Belfast skyline.

This sculpture marks the spot where one of the greatest Roman rulers was proclaimed emperor.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This network of narrow, medieval passages has the most delightful name.

A museum marks and documents the site of the Titanic's launch.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Legend says this cave housed a 16th-century cannibal and his family of 48.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Northern Ireland's Brobdingnagian stepping stones.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.