These lesser-known Maltese catacombs date back over 1,700 years.

Enigmatic tombs and cave dwellings on the outskirts of a rural village.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

The longest hedge maze in the world.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

The steepest classic funicular in the world glides along a dizzying incline.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

Great Britain's only hat-making museum.

This historic stone bridge has an entire neighborhood clinging to its sides.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Staves, storm-calling, and of course, necropants.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

An exquisite tunnel of cascading flowers.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.