A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This one-time health resort was used by aristocrats around the world.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Pilgrimage site for star-crossed lovers.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

Scores of wax baby figurines add an unusual mood to this beautiful church on the Greek coast.

This peaceful, round shrine in the middle of the Sri Lankan jungle acts as a beacon of peace.

This elaborate temple was built around one of the Buddha's teeth.

This mesmerizing architectural wonder will take your breath away with its unusual color patterns.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

After the devastating 2011 earthquake, historic Christchurch begins to recover, starting with the pop-up Re:START mall.

The platform atop this verdant volcano was built with the help of a royal elephant.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Hundreds of bras, blowing in the wind.

New Zealand's epic shrine to all things puzzling.

One of the world's steepest streets seems to have houses sliding down it.

Handcrafted thermal spa washes away each night with the tide.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.