The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

One of the world's largest tanks mimics the experience of watching rare whale sharks, giant rays, and deep sea creatures from the ocean floor.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.

Divers can encounter an abandoned warship encircled by a giant kraken submerged in the British Virgin Islands.

Part home garden, part sculpture field, part pseudo-science experiment, a trip to this place will leave you wondering if sea water isn't actually the elixir of life.

The remnants of an abandoned, 19th-century gold mill along Aruba's rugged northeastern coast.

Perhaps the most spectacular grotto along the Algarve coastline.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Unconventional site where the tracks of Zurich tramcars intersect.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Go inside to really appreciate this 500-year-old technological masterpiece.

A mouldering Colombian bull ring stands as a reminder of the country's complicated relationship with a brutal sport.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

This restored colonial house was once home to the botanist responsible for bringing avocados to the U.S.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.