An extraordinary "City of Caves" carved from solid stone.

These animal carvings stand as a representation of India and Britain.

A startling, centuries-old subterranean marvel hides in plain sight.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Underground monastery and fortress.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

You'll find just about anything in this funky Tbilisi flea market.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

This knick-knack-covered house (complete with a matching van) is a charming oddity in the middle of a modest downtown neighborhood.

A high point in Vancouver kitsch.

The collection of signage remembers the midcentury pushback against the new neon light.

Locals transformed this Canadian evergreen into a secret hangout with spectacular views of Vancouver's skyline.

A mineral spring that became all the rage in 17th-century England.

These marks in Myddelton Passage aren't your run-of-the-mill vandalism, and they weren't made by your typical vandal.

It's a mystery why these remains were found with no traces of their bodies in sight.

This 19th-century pub features stained-glass windows celebrating Victorian-era "champions."

Classic game cookery takes center stage at what's widely considered London's oldest restaurant.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

This secluded walkway overlooks a magnificently wild London green space.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

A historic house left in "dramatic still life."

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.